• Easy Installation: Can stick on the wall, and also can fix on the wall
• No Need Cable: The transmitter and receiver no need the cable to connect 
• Wide Usage: Suitable for business offices, villa areas, house apartments, etc. 
• Features: Large sound, strong flashing, 5-speed volume, multiple ringtones
• Convenient and Simple Installation: Wireless distance, easy to install

Specifications:

• Wireless frequency: 315MΗZ/433MΗZ
• Receiver operating voltage: AC100V-240V
• Transmitter: 1 x 23A12V
• Standby power consumption: 0.5W 
• Wireless distance: 280m (barrier-free)
• Ringing volume: 36 ringtones / 5 levels of volume adjustment